can i run a bafang 48v 250w bbs01 using a 36v battery?

[it is i footpump]

hi all i am in the process of builling a scott aspect mtb equiped with bafang 48v 250 bbs01 moter ,and 48v 13 ah downtube battery.
my friends go on long rides and have merida/cube ebikes with 750w /650w in frame batteries, my m8 did 30miles ,hilly trying different assist levels and used approx 30% of 650w battery.
i have no idea what range my 48v 13ah and using peddle assist 48v 250 cadence sensor will give me? i use high levels of assist on my other ebikes.
i have a 36v 13ah battery pack and all connections are xt60, if i ran out of charge could i use the 36v with the 48v moter to get home ? as the last 3 miles to my home are steepish thank you

 

[Saracen]

hi all i am in the process of builling a scott aspect mtb equiped with bafang 48v 250 bbs01 moter ,and 48v 13 ah downtube battery.
my friends go on long rides and have merida/cube ebikes with 750w /650w in frame batteries, my m8 did 30miles ,hilly trying different assist levels and used approx 30% of 650w battery.
i have no idea what range my 48v 13ah and using peddle assist 48v 250 cadence sensor will give me? i use high levels of assist on my other ebikes.
i have a 36v 13ah battery pack and all connections are xt60, if i ran out of charge could i use the 36v with the 48v moter to get home ? as the last 3 miles to my home are steepish thank you

I can do 30 miles on one battery in Wales including 2 steep hills on that motor and battery with "just" one bar left, any more and I carry TWO batteries, even then that is in ideal weather.

 

[Saracen]

750w /650w in frame batteries ????

If you mean motors they are UK illegal

 

[sjpt]

750w /650w in frame batteries ????

I think they meant 750wh /650wh

 

[matthewslack]

Your 48V / 13Ah battery is 624Wh, so similar to the other bikes. Your cadence sensor bike on high assist will use more battery than a torque sensored Bosch etc, but even if it uses double there is still plenty left on that 30 mile route.

I would just learn to manage the battery over the length of the ride, using lower assist when you can to stretch the range, and keeping enough for the way home.

I suspect if you switch voltage you might have to change settings, but I don't know for sure. That would be too much hassle for me.

 

[saneagle]

hi all i am in the process of builling a scott aspect mtb equiped with bafang 48v 250 bbs01 moter ,and 48v 13 ah downtube battery.
my friends go on long rides and have merida/cube ebikes with 750w /650w in frame batteries, my m8 did 30miles ,hilly trying different assist levels and used approx 30% of 650w battery.
i have no idea what range my 48v 13ah and using peddle assist 48v 250 cadence sensor will give me? i use high levels of assist on my other ebikes.
i have a 36v 13ah battery pack and all connections are xt60, if i ran out of charge could i use the 36v with the 48v moter to get home ? as the last 3 miles to my home are steepish thank you

The answer is yes, but it's not a simple yes. A fully charged 36v battery is 42v, but it immediately drops to 41v, then goes down more or less linearly to around 33v. Your 48v Bafang has settings, where you can adjust the voltage at which the controller will shut down. The default setting is normally 41v, which probably won't get you to the end of the street with the 36v battery, but you can adjust it down to 39.5v, which should give you 3 to 5 miles, depending on how much power you use and how much sag you get from your battery.

A 13ah 36v battery is pretty heavy. It would be a pain to have to carry that for 30 odd miles for the sake of 3 miles. Is it worth it? It might be better to divert the energy from carrying the battery to pedalling harder.`

 

[Nealh]

hi all i am in the process of builling a scott aspect mtb equiped with bafang 48v 250 bbs01 moter ,and 48v 13 ah downtube battery.
my friends go on long rides and have merida/cube ebikes with 750w /650w in frame batteries, my m8 did 30miles ,hilly trying different assist levels and used approx 30% of 650w battery.
i have no idea what range my 48v 13ah and using peddle assist 48v 250 cadence sensor will give me? i use high levels of assist on my other ebikes.
i have a 36v 13ah battery pack and all connections are xt60, if i ran out of charge could i use the 36v with the 48v moter to get home ? as the last 3 miles to my home are steepish thank you

Simple answer yes for a very short while , logical answer no unless you like peddaling with no power.
I can tell you BBS01 is a POS to pedal unpowered for more then a mile or two, it is bad enough going a couple hgundred yards.